From 77d76b73a614820bf45024b053db376f35b06d10 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sat, 1 Aug 2026 17:10:33 +0800
Subject: [MIR] Add compilation unit reference context

---
 backend/unittests/CodeGen/CMakeLists.txt          | 12 +++++
 backend/unittests/CodeGen/CompilationUnitTest.cpp | 58 +++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 backend/unittests/CodeGen/CompilationUnitTest.cpp

(limited to 'backend/unittests/CodeGen')

diff --git a/backend/unittests/CodeGen/CMakeLists.txt b/backend/unittests/CodeGen/CMakeLists.txt
index b0bdd13..e128d0b 100644
--- a/backend/unittests/CodeGen/CMakeLists.txt
+++ b/backend/unittests/CodeGen/CMakeLists.txt
@@ -2,6 +2,7 @@
 
 set(
   RCCBackendCodeGenTestSources
+  CompilationUnitTest.cpp
   CoreTypesTest.cpp
   InstructionDescriptorTest.cpp
   MachineCompilationStatusTest.cpp
@@ -19,6 +20,15 @@ set(
   TargetRegisterInfoTest.cpp
 )
 
+add_executable(RCCBackendCodeGenCompilationUnitTests CompilationUnitTest.cpp)
+rcc_backend_configure_target(RCCBackendCodeGenCompilationUnitTests)
+target_link_libraries(RCCBackendCodeGenCompilationUnitTests PRIVATE RCCBackend::CodeGen)
+
+add_test(
+  NAME RCCBackend.CodeGen.CompilationUnit
+  COMMAND RCCBackendCodeGenCompilationUnitTests
+)
+
 add_executable(RCCBackendCodeGenCoreTypesTests CoreTypesTest.cpp)
 rcc_backend_configure_target(RCCBackendCodeGenCoreTypesTests)
 target_link_libraries(RCCBackendCodeGenCoreTypesTests PRIVATE RCCBackend::CodeGen)
@@ -188,6 +198,7 @@ add_test(
 )
 
 rcc_backend_register_format_files(
+  "${CMAKE_CURRENT_SOURCE_DIR}/CompilationUnitTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/CoreTypesTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/InstructionDescriptorTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/MachineCompilationStatusTest.cpp"
@@ -205,6 +216,7 @@ rcc_backend_register_format_files(
   "${CMAKE_CURRENT_SOURCE_DIR}/TargetRegisterInfoTest.cpp"
 )
 rcc_backend_register_tidy_files(
+  "${CMAKE_CURRENT_SOURCE_DIR}/CompilationUnitTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/CoreTypesTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/InstructionDescriptorTest.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/MachineCompilationStatusTest.cpp"
diff --git a/backend/unittests/CodeGen/CompilationUnitTest.cpp b/backend/unittests/CodeGen/CompilationUnitTest.cpp
new file mode 100644
index 0000000..39cd175
--- /dev/null
+++ b/backend/unittests/CodeGen/CompilationUnitTest.cpp
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/CodeGen/CompilationUnit.h"
+
+#include "rcc/CodeGen/MachineFunction.h"
+
+#include <iostream>
+#include <utility>
+
+namespace {
+
+int fail(const char *Message) {
+  std::cerr << Message << '\n';
+  return 1;
+}
+
+} // namespace
+
+int main() {
+  rcc::CompilationUnit Unit;
+  auto Empty = Unit.createMachineFunction("");
+  if (Empty || Unit.functionCount() != 0)
+    return fail("CompilationUnit must reject an empty function name atomically");
+
+  auto First = Unit.createMachineFunction("first");
+  if (!First || (*First)->stableID().value() != 1)
+    return fail("CompilationUnit must allocate the first stable function identity");
+
+  auto Duplicate = Unit.createMachineFunction("first");
+  if (Duplicate || Unit.functionCount() != 1)
+    return fail("CompilationUnit must reject duplicate function names atomically");
+
+  auto Second = Unit.createMachineFunction("second");
+  if (!Second || (*Second)->stableID().value() != 2)
+    return fail("Rejected function creation must not consume a StableID");
+  if (Unit.functionCount() != 2 || Unit.functionAt(0) != *First || Unit.functionAt(1) != *Second)
+    return fail("CompilationUnit must preserve function document order");
+  if (Unit.function("first") != *First || Unit.function("missing") != nullptr)
+    return fail("CompilationUnit must provide exact name lookup");
+  if (Unit.function((*Second)->stableID()) != *Second ||
+      Unit.function(rcc::MachineFunctionStableID::fromValue(99)) != nullptr)
+    return fail("CompilationUnit must provide exact StableID lookup");
+  if (Unit.functionAt(2) != nullptr)
+    return fail("CompilationUnit must reject an out-of-range ordered lookup");
+
+  auto Verification = Unit.verify();
+  if (!Verification)
+    return fail("A valid CompilationUnit must pass verification");
+
+  rcc::CompilationUnit Moved = std::move(Unit);
+  if (Moved.functionCount() != 2 || Moved.function("first") != *First ||
+      Moved.function("second") != *Second)
+    return fail("Moving a CompilationUnit must preserve owned function addresses and indices");
+  Verification = Moved.verify();
+  if (!Verification)
+    return fail("A moved CompilationUnit must pass verification");
+  return 0;
+}
-- 
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